PATCH to gnuv3_rtti_type

[Jason Merrill <jason at redhat dot com>]

gnuv3_rtti_type still gets confused sometimes, by constructor vtables and
namespaces at least.  This wouldn't be a big problem, as mostly I don't
care what the real type is, except that it gives an error and aborts.  If
I'm just trying to print the contents of a pointer, this is rather
annoying.

This patch changes the errors to warnings, so that I get the normal output
which is all I really care about.

OK?

2002-04-14  Jason Merrill  <jason@redhat.com>

	* gnu-v3-abi.c (gnuv3_rtti_type): If we get confused, just warn
	and return NULL.

*** gnu-v3-abi.c.~1~	Sun Mar 17 17:10:01 2002
--- gnu-v3-abi.c	Sun Apr 14 22:59:39 2002
*************** gnuv3_rtti_type (struct value *value,
*** 241,262 ****
    vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
    if (vtable_symbol_name == NULL
        || strncmp (vtable_symbol_name, "vtable for ", 11))
!     error ("can't find linker symbol for virtual table for `%s' value",
!            TYPE_NAME (value_type));
    class_name = vtable_symbol_name + 11;
  
    /* Try to look up the class name as a type name.  */
    class_symbol = lookup_symbol (class_name, 0, STRUCT_NAMESPACE, 0, 0);
    if (! class_symbol)
!     error ("can't find class named `%s', as given by C++ RTTI", class_name);
  
    /* Make sure the type symbol is sane.  (An earlier version of this
       code would find constructor functions, who have the same name as
       the class.)  */
    if (SYMBOL_CLASS (class_symbol) != LOC_TYPEDEF
        || TYPE_CODE (SYMBOL_TYPE (class_symbol)) != TYPE_CODE_CLASS)
!     error ("C++ RTTI gives a class name of `%s', but that isn't a type name",
!            class_name);
  
    /* This is the object's run-time type!  */
    run_time_type = SYMBOL_TYPE (class_symbol);
--- 241,273 ----
    vtable_symbol_name = SYMBOL_DEMANGLED_NAME (vtable_symbol);
    if (vtable_symbol_name == NULL
        || strncmp (vtable_symbol_name, "vtable for ", 11))
!     {
!       warning ("can't find linker symbol for virtual table for `%s' value",
! 	       TYPE_NAME (value_type));
!       if (vtable_symbol_name)
! 	warning ("  found `%s' instead", vtable_symbol_name);
!       return NULL;
!     }
    class_name = vtable_symbol_name + 11;
  
    /* Try to look up the class name as a type name.  */
    class_symbol = lookup_symbol (class_name, 0, STRUCT_NAMESPACE, 0, 0);
    if (! class_symbol)
!     {
!       warning ("can't find class named `%s', as given by C++ RTTI", class_name);
!       return NULL;
!     }
  
    /* Make sure the type symbol is sane.  (An earlier version of this
       code would find constructor functions, who have the same name as
       the class.)  */
    if (SYMBOL_CLASS (class_symbol) != LOC_TYPEDEF
        || TYPE_CODE (SYMBOL_TYPE (class_symbol)) != TYPE_CODE_CLASS)
!     {
!       warning ("C++ RTTI gives a class name of `%s', but that isn't a type name",
! 	       class_name);
!       return NULL;
!     }
  
    /* This is the object's run-time type!  */
    run_time_type = SYMBOL_TYPE (class_symbol);